Specifications

Fritted Gas Tube · Specifications

Standard sizes are listed below. All products comply with GB/T, ASTM, and ISO standard taper systems. Full range 10/19 ~ 60/45 available. Custom frit grades, configurations, and tube lengths are available.

Request custom specs

1. Straight Fritted Gas Tube

GB/T	ASTM	ISO	Tube O.D. (mm)	Standard Length (mm)	Frit Grade	Material
Please contact us to confirm the available specifications.

2. 15° Angled Fritted Gas Tube

GB/T	ASTM	ISO	Tube O.D. (mm)	Standard Length (mm)	Frit Grade	Material
Please contact us to confirm the available specifications.

3. 90° Bent Fritted Gas Tube

GB/T	ASTM	ISO	Tube O.D. (mm)	Standard Length (mm)	Frit Grade	Material
Please contact us to confirm the available specifications.

4. Frit Grade Guide

Frit Grade	Pore Size (μm)	Typical Application
Please contact us to confirm the available specifications.

* Joint numbers (14#, 19#) indicate the largest diameter (mm) of the taper. All are 1:10 taper.
* GB/ASTM/ISO designations are different standard identifiers — physical dimensions are identical and fully interchangeable.
* Standard tube length is 150mm; custom lengths from 100mm to 500mm available.
* Standard tube O.D. is 8mm; 6mm / 10mm available upon request.
* Full range 10/19 ~ 60/45 available upon request.
* Contact our sales team for MOQ and lead time on custom orders.

✦ Customization Services — We offer custom joint sizes, frit grades, tube configurations, and lengths. Share your specific requirements and our technical team will provide a tailored solution.

Product Description

The fritted gas inlet/outlet tube is a specialized glass tube for introducing or evacuating gases from reaction systems in standard taper glassware. Its defining feature is a sintered glass frit at the tip of a long glass tube extending downward from the standard taper joint. The top features a standard taper joint for connection to reaction vessels, with a side hose connection for vacuum pumps or inert gas supplies.

During gas introduction, gas flows through the tube and exits through the frit, which disperses it into fine bubbles for efficient gas‑liquid or gas‑solid contact. During evacuation, the frit prevents solid particles from being drawn into vacuum lines, protecting downstream equipment. This dual functionality makes it indispensable in Schlenk line operations, hydrogenation reactions, gas scrubbing, and vacuum filtration setups.

Key Features

Borosilicate Glass 3.3: Meets ISO 3585, low thermal expansion, thermal shock resistance up to 280°C, excellent chemical durability
Multi‑Standard Compliance: Precision‑ground 1:10 taper meets GB/T, ASTM E, and ISO 3585 standard taper specifications
Sintered Glass Frit: Available in G1 (coarse, 100-200μm), G2 (medium, 20-35μm), and G3 (fine, 10-20μm) — frit sintered directly to the glass tube
Extended Length: Standard 150mm length delivers gas deep into the reaction vessel for maximum contact
Multiple Configurations: Straight (standard), 15° angled, and 90° bent options for different apparatus setups

Quality Assurance

Each fritted gas tube is inspected for taper accuracy, frit integrity, and dimensional precision to ensure reliable sealing and optimal gas dispersion performance. Custom bulk orders are welcome.

Tip: The frit at the tip disperses gas into fine bubbles for efficient gas‑liquid contact. Check the frit for blockage before use. For corrosive gases, consider PTFE‑coated or specialized configurations.

Applications

Typical Uses

Gas Introduction

Introduce inert gases (N₂/Ar) into reaction systems — the frit disperses gas into fine bubbles for efficient gas‑liquid contact

Gas Scrubbing/Drying

Pass gas through scrubbing or drying media with uniform dispersion

Vacuum Evacuation

Connect to vacuum pumps — the frit prevents solid particles from being drawn into vacuum lines

Schlenk Line Operations

Gas inlet/outlet for inert atmosphere work — frit prevents liquid splashing

Continuous Flow Chemistry

Gas feed port with uniform dispersion

Hydrogenation/Oxidation

Introduce H₂ or O₂ for catalytic reactions with improved gas dissolution

Compatible Equipment

Standard joint flasks, reaction tubes, Schlenk tubes

Schlenk lines, vacuum manifolds

Vacuum pumps, inert gas cylinders

Gas scrubbing/drying apparatus

Tip: The fritted gas tube's key advantage is gas dispersion through the frit. Choose length based on vessel depth to ensure the frit is submerged. Always use matching standard joint sizes for optimal sealing.

Operation & Maintenance

User Guide

Before Use

Inspect for cracks, chips, or scratches on any joint
Check that the frit is intact and not blocked
Clean all joint surfaces with a soft cloth to remove particulates
Confirm that the joint size matches your flask or reaction tube

Installation

Insert the top joint into the reaction vessel and gently twist to seat
Position the tube so the frit is submerged below the liquid surface or near the reaction site
Connect the side hose fitting to vacuum or inert gas lines
For vacuum applications, ensure all joints are well‑seated

Gas Introduction Operation

Gas enters through the side hose fitting and travels down the tube
The frit disperses gas into fine bubbles before it enters the reaction mixture
Bubble size depends on frit grade: G1 → coarse, G2 → medium, G3 → fine
Adjust gas flow rate to avoid damaging the frit or splashing liquid

Cleaning & Storage

Clean immediately after use to prevent frit blockage
Soak in appropriate solvent and gently brush the frit surface
For severe blockage, use ultrasonic cleaning or back‑flushing
Air dry and store with protective paper between ground joints
Protect the frit from impacts

Fritted Gas Tube · Selection Guide

Four key dimensions determine the right fritted gas tube for your system: frit grade, tube configuration, tube length, and joint size.

1. By Frit Grade

Frit Grade	Pore Size (μm)	Typical Application
Please contact us to confirm the available specifications.

2. By Tube Configuration

Configuration	Features	Typical Use
Please contact us to confirm the available specifications.

3. By Tube Length

Choose length based on reaction vessel depth to ensure the frit is submerged or positioned at the reaction site.

Length Range	Recommended Vessel
Please contact us to confirm the available specifications.

4. By Joint Size

Scale	GB/T	Typical Volume	Matching Apparatus
Please contact us to confirm the available specifications.

5. Quick Selection Checklist

Follow this decision flow to quickly identify the right configuration:

① Frit pore size needed? Coarse/large bubbles → G1 | General → G2 | Fine/micro bubbles → G3
② Space constraints? Open → Straight | Angled needed → 15° Angled | Vertical limit → 90° Bent
③ Vessel depth? Shallow → 100mm | Standard → 150mm | Deep → 200mm+
④ Scale? Micro → 14# | Standard → 19#/24# | Large → 29#+

✦ Need help selecting? Contact our technical support team with your vessel specifications and gas introduction requirements — we'll recommend the optimal configuration.

Care & Notes

Show care & notes

Safety Precautions

Always operate in a fume hood when handling flammable or toxic gases
Verify joint seal integrity before applying vacuum
For pressurized gas operations, verify system pressure rating
Wear protective gloves and safety goggles

Do not

Never use cracked or damaged tubes under vacuum or pressure